I don't need to have "resided in a person's heart" when they've already made it known. The RCC teaches a false salvation which adds works to faith. The Bible plainly says that anyone who leaves the true church was never really a part of it, and MO4 has left any vestage of Christianity behind. It is therefore quite reasonable to conclude that she has not experienced saving faith in the Biblical Jesus. Her stated faith is in Islam, in its god Allah.